Starch-liquefying modified thermosetting resin film-coated controlled release fertilizer and preparation method thereof

A starch liquefaction modification and resin coating technology, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as difficulty in sustainable development relying on petrochemical products, high cost of controlled release fertilizers, and slow degradation of polymer residual films. , to achieve the effects of excellent nutrient release performance, suitable for large-scale industrial production, and increased reactivity

Inactive Publication Date: 2013-08-14
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a thermosetting resin-coated controlled-release fertilizer modified by starch liquefaction and a preparation method thereof. , a starch-modified thermosetting resin-coated controlled-release fertilizer suitable for rapid mass production ...

Method used

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  • Starch-liquefying modified thermosetting resin film-coated controlled release fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Add 100g of diethylene glycol, 80g of wheat starch and 1g of concentrated sulfuric acid into a three-necked flask equipped with mechanical stirring and a condenser, and stir to make them evenly mixed. React at 140-150°C for 30 minutes, then cool to about 100°C with an ice-water bath. Put 500g of large granular urea with a diameter of 2-4mm into the drum and heat it to 50-70°C; then put 4.55g of wheat starch coating solution and 4.41g of curing agent polymethylene polyphenyl group cooled to about 100°C The polyisocyanate is quickly sprayed onto the surface of urea granules at the same time, and after 5-6 minutes, it can be directly reacted and solidified to form a film on the surface of the fertilizer. The spraying process is repeated 3 times. After the fertilizer is cooled, it can be packaged and stored. The obtained controlled-release fertilizer film material accounts for about 5% of the total weight of all controlled-release fertilizers, and the controlled-release ti...

Embodiment 2

[0023] Add 80g of polyethylene glycol, 20g of glycerol, 100g of cornstarch and 1g of concentrated sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. React at 140-150°C for 45 minutes, then cool to about 100°C with an ice-water bath to obtain a cornstarch coating solution. Put 500g of large granular urea with a diameter of 2-4mm into the drum and heat it to 50-70°C; then put 5.11g of corn starch coating solution and 4.02g of curing agent polymethylene polyphenyl group cooled to about 100°C The polyisocyanate is quickly sprayed onto the surface of the urea at the same time. After 5-6 minutes, it can be directly reacted and solidified to form a film on the surface of the fertilizer. The spraying process is repeated 3 times. After the fertilizer is cooled, it can be packaged and stored. The obtained controlled-release fertilizer film material accounts for about 5% of the total weight of all controlled-re...

Embodiment 3

[0025] Add 100g of ethylene carbonate, 80g of sweet potato starch and 1.5g of concentrated sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. React at 120-130° C. for 30 minutes, and then cool to about 100° C. in an ice-water bath to obtain sweet potato starch coating solution. Put 500g of large granular urea with a diameter of 2-4mm into the drum and heat it to 50-70°C; then put 5.41g of sweet potato starch coating solution and 3.22g of curing agent polymethylene polyphenyl group cooled to about 100°C The polyisocyanate is quickly sprayed onto the surface of the urea at the same time. After 5-6 minutes, it can be directly reacted and solidified to form a film on the surface of the fertilizer. The spraying process is repeated 3 times. Finally, the fertilizer is cooled to room temperature by a cooler, and then it can be packaged and stored. The obtained controlled-release fertilizer film material acco...

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Abstract

The invention discloses starch-liquefying modified thermosetting resin film-coated controlled release fertilizer and a preparation method of the fertilizer. The method comprises the following steps of: preparing a starch-liquefying modified film coating solution from starch under a certain liquefying condition, and simultaneously spraying the film coating solution and a curing agent on the surfaces of fertilizer particles for direct reaction to obtain a cured film, thus obtaining the starch modified thermosetting resin film-coated controlled release fertilizer which is good in film forming property and strong in water resistance. The film-coated controlled release fertilizer produced by the method disclosed by the invention has excellent controlled release performance, a nutrient release period can be controlled from 1 month to 12 months, and in addition, the film material prepared by the method disclosed by the invention has biodegradability so that a residual film shell in soil is fast in degradation. The fertilizer uses the starch, which is a renewable plant biomass resource, as a film coating material, so that the dependence on petrochemical resources is reduced. Therefore, the method is simple in process and equipment, pretty low in production cost and suitable for large-scale industrialized production and popularization and application to field crops.

Description

(1) Technical field [0001] The invention relates to a thermosetting resin-coated controlled-release fertilizer modified by starch liquefaction and a preparation method thereof, belonging to the field of controlled-release fertilizer production. (2) Background technology [0002] my country is a large agricultural country, and a large amount of fertilizer is used every year, but the utilization rate of fertilizer is very low, which causes a huge waste of economic energy and various environmental pollution problems. Therefore, how to greatly increase the utilization rate of fertilizers, improve the quality of agricultural products, and realize environmentally friendly development is an important problem that needs to be solved urgently in the sustainable and efficient agricultural development. The invention and production of coated controlled-release fertilizers and their application in agriculture have opened up new ideas and more effective ways to solve this problem. [000...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 张民陆盘芳杨越超
Owner SHANDONG AGRICULTURAL UNIVERSITY
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